Handle accessing the process filter/configuration views for an unconfigurable process

Closes #1039 (closed)

I made the "run" button use $router.replace so that pressing Back just returns you to before you started to configure the process. I used some of the things I have learned about the beforeRouteEnter navigation guard to try really hard to move the user away from the configuration pages properly if they still find a way in. I also noticed that if something went completely wrong and no process was loaded or something similar, the page was completely empty, so I added some placeholders.